Street-lamp.



(No Model.)

Patented Apr. 30, |90l.

D. J. PRENDERGAST &. V. H. SLINACK.

STREET LAMP. (Application fxled Oct. 15, 1696.)

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No. 672,960. Patented.Apr. 30, 190i. D. J. PRENDERGAST & V. H. SLINACK.

STREET LAMP.

(Application led Oct. 15, 1896.)

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Witnesses.

' UNITED' STATES PATENT OFFICE.

`DANIEL J. PRENDERGAST, OF NEW YORK, N. Y., AND VICTOR II. SLINACK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO THE PENNSYLVANIA GLOBE GAS LIGHT COMPANY, OF PENNSYLVANIA.

STREET-LAM P.

SPECIFICATION forming part of Letters Patent N O. 672,960, dated. April 30, 1901.

Application filed October 15.1896K Serial No 608,922. (No model.)

Our invention has reference to street-lamps and it consists of certain improvements,which 1o are fully set forth in the following specification and shown in the accompanyingv drawings, which form a part thereof.

The object of our invention i's to provide a construction of lamp, especially intended for incandescent gas-lighting, which shall be peculiarly adapted for outside work.

The following are the essential features to which our improvements are directed: The lamp proper is inclosed in a removable glass zo globe and comprises one or more incandescent gas-burners employing a delicate mantle of refractory material combined with an adjustable shield adapted to be moved down to inclose the mantle so as to protect it against z5 currents of air, which would otherwise rupture and destroy it. We prefer to form this shield in such a manner that it may be adjusted without opening the bottom of the lamp, whereby the mantle may be thoroughly protected before removing the surrounding globe to any appreciable extent. We prefer, furthermore, to so form the shield that it f may act as a chimney to carry off the products of combustion and direct them to the Ventilating-cap. Where there are two j or more burners inclosed within the same globe, we prefer to provide means for simultaneously adjusting all the shields. We prefer also to arrange above the several shields a single directing chimney-flue which shall receive the products of combustion from all of the shields when acting as chimneys and deliver the same 'centrally tothe Ventilatingcap, and thus protect the upper portion of the glass globe from being unduly heated, with the attendantdanger of being cracked by rain, sleet, or snow.

Asecond part of our invention is comprised in the construction of the burner proper, whereby the burner and mantle are flexibly .supported upon the gas-supplying devices,

the same having capacity for compensating for vibration imparted to the gas-supplying tube from any sudden jarring to the lamp-l post. This improvement is especially designed to prevent the breakage of the delicatemantle, which frequently results from sudden jars, so liable to occur with lamp-posts for outside lighting.

Another improvement embodied in our improved lamp is comprised in the non-conducting packing about the exposed portion of the gas-supply pipe between the tube of the lamppost at the base-cap of the glass globe. Our` object in this construction is to Aprovide means to prevent condensation and freezing of the contents of the gas-pipe in very cold weather, which renders the lamp defective in operation. Y

Another part of our invention comprises a 7o gas-lighting pipe made Y-shaped or otherwise formed with branches leading from the main valve for conveying a flame from the base of the lamp-globe up to the burner adjacent to the mantles. By this construction the insertion of a single taper or match will light all of the burners simultaneously. The main valve is so arranged that it simultaneously supplies gas to all of the burners and to the lightingtube and after the ignition of the burners to shut oif the supply of gas to the igniting-tube, but continue t0 supply gas to the burners.

More specifically considered, our improvement comprehends the vertical adjustment of the said Y-shaped or branching ignitingtubes to compensate for possible variations inthe elevation of the main burners.

A further portion of our invention comprehends a valve opening into the main valvecase from the outside for the purpose of introducing a solvent into the main gas-pipe close to the valve for the purpose of dissolv- 'ing or thawing out the contents of said pipe when the same has become clogged in cold Weather. 5

A further improvement embodies the basecap of the globe, whereby the same is supported upon the gas-pipe and does not put any weight upon the globe proper. The preferred construction is such that this base-cap can be adjusted laterally, so as to properly centralizeit upon the bottom of the globe, and at the same time it acts as a support for the outside casing for the non-conducting packing around the exposed gas-pipe. The casing is extensible, so as to be capable of adjustment to suit various lengths of the gaspipe and for irregularities in the length of the globe.

These various improvements defined above comprise the main features of our invention, and they, together with the details, will be better understood by reference to the accompanying drawings, in which- Figure l is an elevation of our improved street-lamp, with the globe and Ventilatingcap in section. Fig. 2 is a sectional elevation on line a; of Fig. l,showing the details of the lamp structure on a larger scale. Fig. 3 is a sectional plan View of same on line g/ y. and Fig. 4 is asectional elevation of the main valve.

A is the lamp-post.

A represents the supporting-arms, connected at the top to a ring-support A2.

B is the glass globe, having a rib l), which rests upon the ring A2, so as to hang down between the arms A. This globe is open at the bottom, and at the top supports the ventilating-cap B'. A reector or hood B2 may be supported upon the ring A2, if so desired.

C is the gas-pipe leading up through the lamp-post A and is fitted at the top within a main valve C. Opening from the top of the main valve is a Y-shaped gas-pipe C2, upon the upper arms of which are supported the two incandescent gas-burners D D. Vhile we have shown two gas-burners, our improvements may be employed with one or more.

We do not conne ourselves to any particular number of burners when considering our improvements broadly.

Referring to the construction of the burners D, E is the gas-supply pipe, having the air-apertures e, which receive the air admittedthrough the screen Fand valve C. In practice the valve G may be omitted and the parts properly proportioned to perform their work. The screen F is supported at the bottom by the disk F', fitted upon the top of the Y-shaped pipe C2, and upon the upper part of the screen rests an inclosing plate F2. By means of this screen no insects can get to the interior of the burners and clog the gas-passages. H is the gas-burner proper and is formed with a somewhat conical gas-passage 7L, flaring downward and loosely supported upon springs I, guided upon rods t'. These rods 'L' are connected to the burner-ring H by radial arms I and are guided in bearings H2 in the base F2 below the screen. Heads or obstructions on the bottom of these rods limit the upward movement of the burner. The springs are made delicate, so that they properly sustain the weight of the burner,together with the mantle and accessories, to permit in case of jarring of the gas-pipe and connections free movement without imparting to the burner and the mantle which it supports a positive blow.

J2 is the mantle and is formed of the usual delicate open structure of refractory material and is supported above the burner H. Vertical guide-rods J are secured at the lower parts to 'the burner and at the top are attached to a guide-ring I. Arranged within the vertical rods and encircling the burner and lower part of the mantle is a conical shield or frustum K, which opens upward at the bottom to properly guide the draft of upwardly-flowing air to the burner and refractory mantle. Arranged above the refractory mantle and vertically adjustable through the ring J is a .tubular shield L, having a diameter larger than the smaller part of the conical shield K and having a vertical height greater than the distance from the ringlguide to the shield, so that it may be completely lowered and tit over the conical shield in a manner to thoroughly protect the mantle from all side drafts or currents of air. The vertically-adjustable shield L is provided with a bead near its upper end, by which it is supported in a suitable ringframe L', which is attached to the upper part of a tube L2, guided upon an upright guiderod L2, the latter being secured to the Y- shaped tube C2 at c. To adjust the shield L vertically, we provide a vertically-movable rod M, which connects with the verticallyadjustable tube L2 and extends th rough the base-cap N, and a suitable clamp m, comprisinga guide-'aperture and clamp-screw. By this means the vertically-adjustable shields may be raised and clamped in the elevated position shown or may be lowered to compietely inclose the mantle without opening or removing the globe B.

In the foregoing description of the burner we have described our improvements with reference to a single burner; but where there are two or more burners these parts are simply duplicated and both or all of the tubular shields are simultaneously raised and lowered by the same adjusting-rod M.

Arranged above the tubular shields L is a centralizing-chimney T, which has a Haring lower partat t to insure any or all products of combustion passing upward from the tubes L and directing the same centrally into the Ventilating-cap B. The upper part of the centralizing-chimney is provided with straps T, which extend upward and are hooked over the edges of the apertures of the Ventilatingcap, as clearly shown. In this manner the chimney T is centrally supported and easily removable when desired. By this means the hot products of combustion are conveyed away from the upper portion of `the glass globe, and as air-currents may freely pass from the base upward and between the globe and centralizing-chimney the glass iskept fairly cool and therefore not liable to become cracked in cold and stormy weather.

The base-cap N consists of an open casting,

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practically of a diameter to fit the opening in the bottom of the glass globe B.. The basecap is provided with three or more radial adjustable guides n, which do not necessarily clamp the globe. This cap is provided with glass windows N to permit the rays of light to pass freely down around the base of the lamp -post and avoid the casting of deep shadows. The base-cap is also provided with an aperture N2 for entering the igniting taper or match, adjacent to which is pivoted a door N3, which may be moved laterally to open or close the aperture. The center of the cap is made with an enlarged opening and is provided with three or more clamping-screws N4, adapted to clamp upon the central gas-pipe C, and by means of which the cap may be centered relatively to the base of the globe B or to the gas-pipe, as desired.

O is a piece of tube secured to the base-cap N by the clamping-screws and is adapted to telescope with a second section of tube O', resting upon the top of the lamp-post and within the socket a, to which the upright arms A are secured at their base. Y

O2 is apacking of. asbestos or other nonconducting substanceinterposed between the tubes O' and the gas-pipe C.

To one side of the main valve C' is arranged a tubular arm P', the end of which is controlled througha portp in the valve by means of a rotary reciprocating valve c,which is operated by an arm O4. The arms C4 may be moved by inserting a hook or manipulating device through the aperture N2 in the basecap N. Supported in the free end of the tubular pipe P and adjustable vertically therein at P is an upright tubular portion P2, which branches into two or more branches P3, leading up to the burners H H. The severalpipes P2 and P3 are provided with a series of small gas-apertures along their length and for the purpose of causing a flame to travel from one end to the other up to the burners. We prefer to form the end of the tubular portion P also with apertures, so that the dame may ignite close to the opening N2in the base-cap and be c'aused to travel up to all ot the burners simultaneously. The main valve C' supplies gas to the burners simultaneously with the supply of gas to the pipes P', P2, and P3, so that the flame may be supplied to the main burner without opening the glass globe or lowering the base-cap. When the main valve is moved to its fullest extent, thegas continues to be supplied to the burners, but is shut off from the pipe P. The main burners continue to burn, but the flames on the pipes a small valve or plug S, adapted to close au entrance into the gas-pipe through the main valve C. By removing this plug or valvewe are permitted to pour into the pipe a suitable solvent or liquid for thawing out the same, and thus permitting the rectifying of the defects without the least danger to the lamps as an entirety and without loss of time, which would result upon any attempt to dismantle the parts.

While we prefer the specific constructions herein set out, we do not confine ourselves to the details, as they may be modified in various ways without departing from the principle of our invent-ion.

What we claim as new, and desire to secure by Letters Patent, is-

1. In a street-lamp, the combination of a gas-burner, an incandesciug mantle of refractory material above the burner, an outer removable glass globe, a vertically-adjustable tubular shield adapted to be raised above or moved down over the mantle to inclose it, means for adjusting the said tubular shield from the outside of the globe whereby the shield may be adjusted without removing the globe, a ventilatiug-cap supported upon the top of the glass globe, and a centralizing sta tionary chimney arranged above the adjustable tubular shield and extending below the cap and within the glass globe whereby an airpassage is permitted between the glass globe and centraliZing-chimney.

2. In a street-lamp, the combination of two or more gas-burners, a single glass globe inclosing said burners, a separate mantle of refractory material supported above each burner, vertically-adjustable shields foreach of the burners whereby they may be lowered to completely inclose the refractory mantles, and a single centralizing-chimney arranged above all of'the vertically-adj ustable shields fordelivering the products of combustion centrally to the Ventilating-cap and forming au air-passage between the glass globe and the chimney.

3. In a street-lamp, the combination of two or more gas-burners, a single glass globe inclosing said burners, a separate mantle of refractory material supported above each burner, vertically-adjustable shields foreach of the burners whereby they maybe lowered to completely inelose the refractory mantles, a single centralizing-chimney arranged above all of the vertically-adjustable shields for delivering the products of combustion centrally to the Ventilating-cap and forming an airpassage between the glass globe and the chim` ney, and a single adjusting device extending to a point ou tside the globe for simultaneously adjusting all of the verticallyadjustable shields. j

4:. In a street-lamp, the combination of two or more gas-burners, a single glass globe inclosing said burners, a separate mantle of refractory material supported above each burner, vertically-adj ustable shields for each IOD IIO

of the burners whereby they may be lowered to completely inclosethe refractory mantles, a conical shield encircling the burners and the base of the refractory mantles and of smaller diameter at the top than the diameter of the vertically-adjustable shield so as to be received within them when they are lowered, and a single centralizing-chimney arranged above all of the vertically-adjustable shields for delivering the products of combustion centrally to the Ventilating-cap and forming an air-passage between the glass globe and the chimney.

5. In a street-lamp, the combination of a lamp-post, a gas-pipe extending above the lamp-post and leading to the burners, a glass globe surrounding the burners and provided at the base with a cap, a non-conducting packing surrounding the gas-pipe between the top of the lamp-post and the bottom of the globe base-cap, and a telescopic tubular casing inclosing the gas-pipe and packing extensible as to its length, the lower portion of which is supported upon the lamp-post and the upper portion upon the base-cap of the globe, the said casing being adapted to be adjusted to suit dierent heights between the top of the post and base-cap for the globe.

6. In a street-lamp, the combination of the gas-pipe, a gas-burner thereon, an inclosing glass globe, a main valve to supply gas to the burners, an igniting burner-pipe extending from the main valve continuously to the main burner, and a vertically-adj usting extension device connected with the valve-casing at the extreme lower end of the burnerpipe for adjusting the upper end of the igniting-tube relatively to the main burner.

7. In a street-lamp, the combination of the main gas-supply pipe, two or more burners arranged to receive gas therefrom, an igniting burner-pipe leading from the main gas-supply pipe and provided with branching pipes perforated throughout their length leading to the burners respectively whereby both burners may be ignited simultaneously, incandescing inantles supported above the burners and wholly above the said branching pipes so that the gas may be ignited before passing over the mantles to avoid a downward explosion with the danger of breakage of said mantles, and a single-valve device for simultaneously controlling the gas to both burners and both igniting burner-pipes and whereby the gassupply to the igniting burner-pipe may be wholly cut off when the supply of gas to the main burner is wholly turned on.

8. In a street-lamp, the combination of the gas-supply pipe, two or more burners arranged to receive gas therefrom, a single valve to control the gas to said burners simultaneously, a continuous perforated igniting burner-pipe leading from the main valve and branching to each of the burners whereby each of the burners may be ignited simultaneously and means at the bottom of the branching pipe to adj ust all of the branching pipes simultaneously vertically with reference to the other burners.

9. In a street-lamp, the main gas-pipe, and airand gas mixing chamber and burner-tube secured to the upper part of the gas-pipe, in combination with a burner proper having a downwardly-extending enlarged tubular portion loosely receiving the burner-tube, elastic supports for the burner whereby it is sustained independently of the burner-tube, a refractory mantle supported over the burner, a support for the mantle connected to and movable with the burner, a stationary igniting-tube leading from the main gas-pipe and extending upward to the burner but independent of it so as not to interfere with its movement, and valve devices for controlling the gas-supply to the mixing-chamber and burner-tube and to the igniting-tube simultaneously or to the mixing-chamber and burner alone.

10. In a street-lamp, the combination of the main gas-pipe, an air and gas mixing chamber and burner-tube secured to the upper part of the gas-pipe, a burner proper having a downwardly-extending enlarged tubular portion loosely receiving the burnertube, elastic su pports for the burner whereby 9 it is sustained independently of the burnertube, a refractory mantle supported over the burner, a support for the mantle connected to and movable with the burner, a stationary igniting-tube leading from the gas-pipe and extending upward to the burner but independent of it so as not to interfere with its movement, valve devices for controlling the supply to the mixingchamber and to the iguiting-tube simultaneously or the mixingchamber alone, and an inclosing screen surrounding the air-apertures to the mixingchamber supported independently of the burner and its elastic support.

In testimony of which invention we hereunto set our hands.

DANIEL J. PRENDERGAST. l VICTOR H. SLINACK.

Witnesses as to Prendergast:

J. F. CAssIDY, SAML. H. NEVETT. Witnesses as to Slinack:

R. M. HUNTER, ARTHUR E. SHAW.

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